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Paper: The Inner Size of the Dust Torus in the Seyfert 1 Galaxy NGC 4151
Volume: 360, AGN Variability from X-Rays to Radio Waves
Page: 79
Authors: Minezaki, T.; Yoshii, Y.; Aoki, T.; Kobayashi, Y.; Suganuma, M.; Enya, K.; Tomita, H.; Peterson, B.A.
Abstract: The most intense optical and near-infrared monitoring observations yet made were carried out on the Seyfert 1 galaxy NGC 4151 using the multi-color imaging photometer (MIP) mounted on the MAGNUM telescope. The lag time between the V and K light curves at the flux minimum in 2001 was precisely 48+2-3 days using a cross-correlation analysis. The correlation between the optical luminosity of an active galactic nucleus (AGN) and the lag time between the UV/optical and the near-infrared light curves is presented for NGC 4151 in combination with previous lag-time measurements of NGC 4151 and other AGNs in the literature. The correlation is interpreted as thermal dust reverberation in the AGNs (Minezaki et al. 2004).
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